7 segment 4 digit led display test

led.ino

ub/*
  Showing number 0-9 on a Common Anode 7-segment LED display
  Displays the numbers 0-9 on the display, with one second inbetween.
    A
   ---
F |   | B
  | G |
   ---
E |   | C
  |   |
   ---
    D
  This example code is in the public domain.
 */
 
// Pin 2-8 is connected to the 7 segments of the display.

int pin_A = 2;
int pin_B = 3;
int pin_C = 4;
int pin_D = 5;
int pin_E = 6;
int pin_F = 7;
int pin_G = 8;
int D1 = 9;
int D2 = 10;
int D3 = 11;
int D4 = 12;

int digits[] = {
  B01111110, // 0
  B00110000, // 1
  B01101101, // 2
  B01111001, // 3
  B00110011, // 4
  B01011011, // 5
  B01011111, // 6
  B01110000, // 7
  B01111111, // 8
  B01111011, // 9
};

int digits_count = sizeof(digits)/sizeof(int);

int mask_A = B01000000;
int mask_B = B00100000;
int mask_C = B00010000;
int mask_D = B00001000;
int mask_E = B00000100;
int mask_F = B00000010;
int mask_G = B00000001;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pins as outputs.
  pinMode(pin_A, OUTPUT);     
  pinMode(pin_B, OUTPUT);     
  pinMode(pin_C, OUTPUT);     
  pinMode(pin_D, OUTPUT);     
  pinMode(pin_E, OUTPUT);     
  pinMode(pin_F, OUTPUT);     
  pinMode(pin_G, OUTPUT);   
  pinMode(D1, OUTPUT);  
  pinMode(D2, OUTPUT);  
  pinMode(D3, OUTPUT);  
  pinMode(D4, OUTPUT);  
}

unsigned long cur_digit = 0;

unsigned long lastRender = millis();


// the loop routine runs over and over again forever:
void loop() {
  int digit = 0;
  digit = digits[(cur_digit + 1) % digits_count];
  digitalWrite(D1, HIGH);
  digitalWrite(D2, HIGH);
  digitalWrite(D3, HIGH);
  digitalWrite(D4, LOW); 
  
  digitalWrite(pin_A, digit & mask_A);
  digitalWrite(pin_B, digit & mask_B);
  digitalWrite(pin_C, digit & mask_C);
  digitalWrite(pin_D, digit & mask_D);
  digitalWrite(pin_E, digit & mask_E);
  digitalWrite(pin_F, digit & mask_F);
  digitalWrite(pin_G, digit & mask_G);
  delay(5);
  
  digit = digits[cur_digit];
  digitalWrite(D1, LOW);
  digitalWrite(D2, LOW);
  digitalWrite(D3, LOW);
  digitalWrite(D4, HIGH); 
  digitalWrite(pin_A, digit & mask_A);
  digitalWrite(pin_B, digit & mask_B);
  digitalWrite(pin_C, digit & mask_C);
  digitalWrite(pin_D, digit & mask_D);
  digitalWrite(pin_E, digit & mask_E);
  digitalWrite(pin_F, digit & mask_F);
  digitalWrite(pin_G, digit & mask_G);
  delay(5);
 
  if ((millis() - lastRender) >= 500) {
    lastRender = millis();
    cur_digit = ++cur_digit % digits_count;
  }
}